(figuratively, informal) Synonym of ne pas avoir inventé le fil à couper le beurre

it never rains but it pours

barking dogs seldom bite, one's bark is worse than one's bite, all talk no bite

(transitive) to not know someone from Adam; to not know or recognize someone at all

(informal) not to believe one's ears

(informal) not to believe one's eyes

(transitive with à) to leave (somebody) indifferent

(figuratively, informal, of people) not to line up, not to queue up, not to crowd in, not to fall over each other (with the implied meaning that something meets with little success)

(informal) not to be faint-hearted, not to be backward in coming forward, to have guts, to have plenty of nerves

to show no sign of life, not to let people know that one's alive